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| 型號(hào)： | TPS84210RKGT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PQCC39 |
| 封裝： | 9 X 11 MM, 2.80 MM HEIGHT, GREEN, PLASTIC, BQFN-39 |
| 文件頁(yè)數(shù)： | 9/26頁(yè) |
| 文件大?。?/td> | 875K |
| 代理商： | TPS84210RKGT |
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INH/UVLO
AGND
Q1
INH
Control
SLUSAN7
– SEPTEMBER 2011
Output On/Off Inhibit (INH)
The INH pin provides electrical on/off control of the device. Once the INH pin voltage exceeds the threshold
voltage, the device starts operation. If the INH pin voltage is pulled below the threshold voltage, the regulator
stops switching and enters low quiescent current state.
The INH pin has an internal pull-up current source, allowing the user to float the INH pin for enabling the device.
If an application requires controlling the INH pin, use an open drain/collector device, or a suitable logic gate to
interface with the pin. Do not place an external pull-up resistor on this pin. Figure 22 shows the typical application
of the inhibit function.
Turning Q1 on applies a low voltage to the inhibit control (INH) pin and disables the output of the supply, as
shown in Figure 23. If Q1 is turned off, the supply executes a soft-start power-up sequence, as shown in
Figure 24. The waveforms were measured with a 2-A constant current load.
Figure 22. Typical Inhibit Control
Figure 23. Inhibit Turn-Off
Figure 24. Inhibit Turn-On
Copyright
2011, Texas Instruments Incorporated
17
Product Folder Link(s): TPS84210
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